What did the three unclean spirits from the mouths of the dragon, beast and false prophet look like?

Answer: Frogs

John saw three unclean spirits that looked like frogs, demonic spirits who gather the kings of the earth for battle.

“And I saw three unclean spirits that looked like frogs coming out of the mouths of the dragon, the beast, and the false prophet.”— Revelation 16:13 (BSB)